J/AJ/142/126ivo://CDS.VizieR/J/AJ/142/126doi:10.26093/cds/vizier.51420126CDSSmolinski J.P.Martell S.L.Beers T.C.Lee Y.S.2017-11-28T13:21:44Z2013-02-28T16:42:10ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frglobular-star-clustersvisible-astronomysloan-photometryspectroscopyWe present a homogeneous survey of the CN and CH band strengths in eight Galactic globular clusters observed during the course of the Sloan Extension for Galactic Understanding and Exploration sub-survey (SEGUE) of the Sloan Digital Sky Survey. We confirm the existence of a bimodal CN distribution among red giant branch (RGB) stars in all of the clusters with metallicity greater than [Fe/H]=-1.7; the lowest metallicity cluster with an observed CN bimodality is M53, with [Fe/H]~=-2.1. There is also some evidence for individual CN groups on the subgiant branches of M92, M2, and M13, and on the RGBs of M92 and NGC 5053. Finally, we quantify the correlation between overall cluster metallicity and the slope of the CN band strength-luminosity plot as a means of further demonstrating the level of CN enrichment in cluster giants. Our results agree well with previous studies reported in the literature.2011AJ....142..126Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/142/126CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVII/103 : Galactic Globular Clusters (Monella 1985)VII/151 : Galactic Globular Clusters Structure Parameters (Webbink 1985)J/A+A/486/437 : CN and CH line strengths in 8 Galactic GlCl (Kayser+, 2008)J/AJ/125/197 : CN abundances of the 47 Tuc main sequence (Harbeck+, 2003)J/ApJ/700/523 : Galactic star clusters in SDSS. II. Colors. (An+, 2009)J/A+A/524/A44 : CN and CH line strengths in 12 globulars (Pancino+, 2010)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/142/126https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/142/126http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/142/126https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/142/126https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/142/126http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/142/126GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/142/126/table1 (Globular cluster photometric properties (as drawn from the literature))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/142/126/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/142/126/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/142/126/table1?GETtext/xml+votable180.050000true259.280791743.13594440.005555555555555556Cone search capability for table J/AJ/142/126/table3 (Line indices of adopted true member stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/142/126/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/142/126/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/142/126/table3?GETtext/xml+votable180.050000true259.0486943.06008310.0055555555555555566/9436 9664 9666 10336 10337 10338 12405 12407 12943 19091 27975 27981 27984 279863.588997330618193e-19 4.653515163505597e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/142/126?format=asciiOpticaldefaultJ/AJ/142/126/table1Globular cluster photometric properties (as drawn from the literature)GLONGalactic longitudedegpos.galactic.lonDEJ2000Declination (J2000)pos.eq.dec;meta.mainrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintClusterCluster namemeta.idcharCNameCluster name as in table3meta.id;meta.maincharprimaryRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainGLATGalactic latitudedegpos.galactic.latfloat(m-M)0Extinction corrected distance modulus (1)magphot.mag.distModfloatE(B-V)Interstellar reddening, from Schlegel et al. (1998ApJ...500..525S)magphot.color.excessfloatn_E(B-V)[c] c if E(B-V) from Grundahl et al. (2002A&A...395..481G)meta.notecharrtTidal radiusarcminphys.size.radiusfloatSimbadSimbad column added by the CDSmeta.refcharJ/AJ/142/126/table3Line indices of adopted true member starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintCNameCluster namemeta.id.parentcharspecIDspSpec name (Plate-MJD-Fiber) (1)meta.idcharg-rIntrinsic SDSS (g-r) color indexmagphot.color;em.opt.B;em.opt.RfloatgmagSDSS g band magnitudemagphot.mag;em.opt.Bfloate_gmagUncertainty in gmagmagstat.error;phot.mag;em.opt.BfloatS3839Raw S(3839) CN index (2)spect.indexfloate_S3839Uncertainty in S3839stat.errorfloatdS3839Temperature-corrected S(3839) CN indexspect.indexfloatCH4300CH indexspect.indexfloate_CH4300Uncertainty in CH4300stat.errorfloatTypeLuminosity classsrc.spTypecharSimbadNameSimbad column added by the CDSmeta.idchar_RASimbad column added by the CDSdegpos.eq.ra;meta.main_DESimbad column added by the CDSdegpos.eq.dec;meta.main